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740GLE Starting problem 700 1990

posted by  Big Harry on  Sun May 17 08:51 CST 2009
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last visit: Sun Sep 21 11:06 CST 2014
[RELATED]

Hi Pierre,

I would think that no fuel through the injector but flow at the pressure regulator could be either a main fuel pump failure or pressure regulator failure. I am assuming that you have checked the fuel rail pressure and bleed down rate. If you have not, this needs to be done. Low pressure could be either the regulator or fuel pump (you did say that it was running?), but a fast leak down of pressure would point to the main pump.

You should raise the car and have a helper turn the key on while you hold your hand on the main pump. If that is running, disconnect the fuel line from behind the manifold and run it into a container while the engine is cranked. If you have a strong flow at that point, I would suspect that the injectors are not cycling which would indicate a failure of the ECU or the Radio Supression Relay (if so equipped). The RSR can be jumpered out to further eliminate the problem.

Regards,


--
Will Dallas, www.willdallas.us, www.willdallas.org, www.willdallas.com, www.dallasprecision.com 86 245 DL 222K miles, 93 940 260K miles, 88 765 GLE 152K miles, 88 780 246K miles, 93 Buick LaSabre 119,000 miles






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